Orbit Fit and Astrometric record for 17AB5

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 17AB5     
# Created Sun Dec 17 02:38:15 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   17 observations of   17
# Arc:   3.88d
# First observation: 2017/01/03
#  Last observation: 2017/01/07
# Chi-squared of fit:   143.66 DOF:   28 RMS:  0.51
# Min/Max residuals:    -1.11    1.50
# Exact a, adot, b, bdot, g, gdot:
  3.476210E-05  2.241435E-01  1.753258E-05  1.020098E-01  1.020648E-01  2.117153E-02
# Covariance matrix:
  5.9340E-12  4.2489E-08 -2.5353E-14  3.4025E-09  6.7192E-09 -3.6379E-08
  4.2489E-08  3.1432E-04 -1.7003E-10  2.5104E-05  4.9640E-05 -3.3367E-04
 -2.5353E-14 -1.7003E-10  1.5909E-13 -3.3374E-11 -2.7371E-11 -6.0066E-10
  3.4025E-09  2.5104E-05 -3.3374E-11  2.0122E-06  3.9665E-06 -2.4219E-05
  6.7192E-09  4.9640E-05 -2.7371E-11  3.9665E-06  7.8412E-06 -5.0775E-05
 -3.6379E-08 -3.3367E-04 -6.0066E-10 -2.4219E-05 -5.0775E-05  3.2516E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
   30.121054   95.715880   -0.120564    0.491488   -0.846759  2457756.907881
# Heliocentric elements and errors
Epoch:              2457756.5000  =  2017/01/03
Mean Anomaly:            2.52321 +/-   342.980
Argument of Peri:       39.73494 +/-    16.201
Long of Asc Node:       50.91868 +/-     1.575
Inclination:            36.08281 +/-     0.560
Eccentricity:         0.58556926 +/-    0.1624
Semi-Major Axis:     25.50342707 +/-  159.8704
Time of Perihelion: 2457426.7785 +/-   44926.1
Perihelion:          10.56940421 +/-   66.3844
Aphelion:            40.43744992 +/-  253.5193
Period (y)              128.7971 +/-   1211.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -1.06522562 +/-    0.0173
Ecliptic Y            9.39066526 +/-    0.1727
Ecliptic Z            4.91687829 +/-    0.1007
Ecliptic XDOT        -0.00589220 +/-    0.0002
Ecliptic YDOT        -0.00148311 +/-    0.0011
Ecliptic ZDOT         0.00265182 +/-    0.0007
# Distances at JD0 (AU)
Heliocenter to KBO   10.65337461 +/-    0.1594
Geocenter to KBO      9.79770651 +/-    0.2006
# Hcoef: 11.35

The following table shows the complete astrometric record for 17AB5. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (17AB5) followed by the observatory code and reference code for the source of the astrometry.

2017 01  03.40708  06 33 13.615  +53 23 44.34  21.3w 17AB5     F51  C~25Rv      
2017 01  03.40786  06 33 13.603  +53 23 44.43  21.5w 17AB5     F51  C~25Rv      
2017 01  03.42073  06 33 13.269  +53 23 45.06  21.5w 17AB5     F51  C~25Rv      
2017 01  03.42151  06 33 13.216  +53 23 45.29  21.7w 17AB5     F51  C~25Rv      
2017 01  03.43438  06 33 12.875  +53 23 45.88  21.3w 17AB5     F51  C~25Rv      
2017 01  03.44808  06 33 12.517  +53 23 46.52  21.3w 17AB5     F51  C~25Rv      
2017 01  03.44884  06 33 12.491  +53 23 46.60  21.5w 17AB5     F51  C~25Rv      
2017 01  04.37713  06 32 48.072  +53 24 32.02  21.3i 17AB5     F51  C~25Rv      
2017 01  04.38979  06 32 47.729  +53 24 32.30  21.0i 17AB5     F51  C~25Rv      
2017 01  04.40244  06 32 47.383  +53 24 33.16  21.0i 17AB5     F51  C~25Rv      
2017 01  04.41506  06 32 47.045  +53 24 33.85  21.2i 17AB5     F51  C~25Rv      
2017 01  06.26131  06 31 58.64   +53 25 52.7   21.3R 17AB5     926  C~25Rv      
2017 01  06.28523  06 31 58.06   +53 25 54.0   20.9R 17AB5     926  C~25Rv      
2017 01  06.30705  06 31 57.43   +53 25 54.7   21.0R 17AB5     926  C~25Rv      
2017 01  07.25475  06 31 32.80   +53 26 29.6   21.3R 17AB5     926  C~25Rv      
2017 01  07.26898  06 31 32.36   +53 26 30.4   21.4R 17AB5     926  C~25Rv      
2017 01  07.28330  06 31 31.94   +53 26 30.5   21.7R 17AB5     926  C~25Rv      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

  1   0.0000      0.00    -1.11       0.00     1.50
  2   0.0000      0.00     0.41       0.00    -0.34
  3   0.0000      0.00     0.61       0.00    -0.36
  4   0.0000      0.00     0.13       0.00    -0.17
  5   0.0001      0.00     0.22       0.00    -0.22
  6   0.0001      0.00     0.39       0.00    -0.26
  7   0.0001      0.00     0.31       0.00    -0.21
  8   0.0027      0.00     0.32       0.00     0.49
  9   0.0027      0.00     0.28       0.00     0.17
 10   0.0027      0.00     0.20       0.00     0.44
 11   0.0028      0.00     0.22       0.00     0.54
 12   0.0078      0.00     0.20       0.00     0.17
 13   0.0079      0.00     1.06       0.00     0.52
 14   0.0079      0.00     0.34       0.00     0.36
 15   0.0105      0.00     1.02       0.00    -0.52
 16   0.0106      0.00     0.08       0.00    -0.24
 17   0.0106      0.00    -0.52       0.00    -0.66

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

17AB5    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        25.587    25.587    25.587
ecceobj         0.585     0.585     0.585
incobj         36.039    36.039    36.039
qmin           10.442    10.443    10.442
qmax           40.898    40.898    40.898
amean          25.411    25.411    25.411
amin           25.236    25.237    25.236
amax           25.721    25.721    25.720
emean           0.584     0.584     0.584
emin            0.578     0.578     0.578
emax            0.590     0.590     0.590
imean          35.014    35.015    35.014
imin           34.845    34.846    34.844
imax           35.209    35.209    35.209
excite_mean     0.819     0.819     0.819
fracstop        0.001     0.001     0.001
cjmean          2.397     2.397     2.397

libcent 0      -180.0    -180.0    -180.0
libamp  0      -180.0    -180.0    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean        39.8      39.8      39.8
kozaiamp          0.6       0.6       0.6